Surrey · England
Haslemere External Mastic
We cover Haslemere for sealing brickwork movement joints, render, cladding and façade joints. Old material cut out, joints cleaned and sealed neatly.
- Plants rooting in failed movement joints
- Gaps where render, brick and frames meet
- Rigid filler in a joint that should flex
External mastic in Haslemere
Where two different materials meet, such as brick and render or blockwork and metal, they move at different rates. A flexible sealant bridges the two where mortar or filler would crack. We work on joints between brick and frames, façade panels and concrete & block, and people most often call us about rigid filler in a joint that should flex and moss and dirt in joints with no sealant left.
Outbuildings, garages and conservatories around homes in places like Haslemere add more joints to look after. Leaks usually start at a gutter end, a garage door frame or where an extension meets the house.
Whatever the size of the job, it’s backed by our one-year guarantee.
- Where
- Haslemere (GU27)
- Region
- Surrey
- Guarantee
- One year on every job
- Quote
- A clear price before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Why deal with it now?
Resealing a run of joints in one go is normally better than patching one at a time. Joints of the same age tend to fail together and it means sorting access once. In a smaller place like Haslemere, wherever a wall is exposed, a failed outside joint is a real source of damp. Inside, a split seal lets water into floors and panels just as it would anywhere.
The cost reflects the work involved, not guesswork. That’s why we ask a few questions first and give you a clear price before work begins.
Why choose Mr Mastic in Haslemere
- A choice of colours where the product allows
- Anti-fungal silicone where joints get wet
- Trusted Arbo and Everbuild sealants
- We never seal over old sealant
Read what affects the cost or our reviews.
Haslemere buildings and the weather
The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
For landlords with property near Haslemere station, failed wall and movement joints let damp in, so they’re worth checking between tenancies. If you look after a building such as Shottermill Infant School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. For an older house near a landmark such as Church of St Christopher, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Haslemere is about 11 miles south of Aldershot, in Surrey. Wherever you are in the GU27 postcode area, our applicators can take on external mastic. Haslemere is one of 395 towns and villages in Surrey where we work for external mastic. Crawley is on our list too, about 23 miles from Haslemere.
Every address in GU27 is covered for external mastic. External mastic is available to properties on Church Road, High Street and Longdene Road. Being close to the A286 and A287, Haslemere is easy for our applicators to reach for external mastic. Other places close to Haslemere include Shottermill (1 mile west), Woolmer Hill (1 mile south-west), Hammer (1 mile west), Bramshott Chase (2 miles north-west) and Kingsley Green (2 miles south). We also work in nearby towns such as Guildford (13 miles north-east), Farnham (9 miles north), Cranleigh (11 miles east), Ash (11 miles north), Godalming (8 miles north-east) and Farncombe (9 miles north-east).
Near you in Haslemere
We work in homes and buildings around Woolmer Hill School, The White Lion Public House and Royal School Haslemere and the streets around them. There’s a railway station in Haslemere itself: Haslemere station. A little further out are Haslemere and District Hospital (0.6 miles north-east). Not far away are Upper Lake and Lynchmere Commons.
Nearby places to Haslemere
What else we do in Haslemere
Landlord and commercial work in Haslemere
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Resealing at the right time is simple maintenance.
Landlords and agents in Haslemere can book us as well as homeowners. Sealant work between tenants keeps a property looking cared for.
What affects the quote in Haslemere
Every job gets its own quote. This is what makes a difference:
- The size of the job
- The number of rooms or windows
- Whether the work is at height
- When we can work, for business premises
Combining jobs into one visit is normally more efficient than separate visits. We will give you a clear quote for the lot.
What we need to know
When you contact us, it’s useful to know:
- The problem you’ve noticed
- Access, such as stairs, a lift or height
- The address or postcode of the job
- The rough size of the job
For a quote, ring 0345 464 0079 or email us with the location and a short description of the problem. We’ll send you a clear quote before any work starts.
How the visit works
There is not much for you to do on the day. Point us to the joints and we’ll get on with it. The job generally takes anything from a few hours to several days, depending on the building. For a job in Haslemere, we agree the time, the access and parking before the day. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- First we look over the joints with you, agree which to renew and talk through access.
- The old mastic and anything lodged in the joint is removed.
- The joint faces are cleaned and primed where the sealant needs it.
- Backing rod goes in next, setting the depth and keeping the sealant off the back of the joint.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
Preparing for the visit
- Tell us about any previous sealing or DIY attempts
- For business premises, tell us about site rules or sign-in
- Try not to wet indoor joints just before the visit
How to get a quote
Getting a quote is simple: tell us what needs doing and where, and roughly how big it is. Photos by email help us understand the job, and we will come back to you with a quote.
Related advice
When something else is needed
Some problems need a builder, plumber or other trade rather than us:
- Structural movement, which needs a surveyor or engineer
- Cracks in the bricks or render themselves, away from the joints
- Rising or penetrating damp from elsewhere in the wall
If you are not sure, just phone 0345 464 0079 or email us and we’ll give you a straight answer before you book.
Surfaces we seal
- Render & cladding joints
- Façade panels
- Concrete & block
- Brickwork movement joints
- Copings & trims
- Joints between brick and frames
Aftercare tips
Looking after new joints is easy:
- Have failed joints looked at early
- Keep high-pressure jets off the joints
- Tell anyone working on the walls about the movement joints
- Don’t let climbing plants root in the sealant
Give the sealant the cure time we tell you before anything rubs against it. The surface skins over quickly, but full cure takes longer.
Leaks behind façade panels and render often go unseen. By the time there’s a damp patch, the damage can be well established so early resealing is worth it.
Should I try it myself first?
The biggest DIY mistake is sealing over old sealant. Silicone does not stick to old silicone, so it peels away and traps moisture behind it. All the old material has to come out first.
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
Haslemere questions
Do you cover smaller places like Haslemere?
Yes, we do. We work across London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
I let a flat near Haslemere station. Can you help?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. Just phone 0345 464 0079 or email us with the address and what needs doing, and we’ll send you a clear quote.
Where are you based?
We work from Crawley. Our applicators cover Haslemere.
Do I need to be at home?
It depends on the job. Inside work needs someone to give us access, and for outside work we’ll agree access with you when we book.
How often do external joints need resealing?
It depends on the exposure, the movement and the product. Treat it as a maintenance item and look at it yearly.
What should I tell you?
A short description and the location. If we need more, we’ll ask.
Can you reach joints on upper floors?
It depends on the building. We work on joints that can be reached safely. Tell us about the building and we’ll confirm what access is needed.
Are you an approved applicator?
Yes. We are an ARBOMaster approved applicator, the approved applicator scheme for Arbo sealants.